<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><link rel="stylesheet" href="../jacoco-resources/report.css" type="text/css"/><link rel="shortcut icon" href="../jacoco-resources/report.gif" type="image/gif"/><title>ReflectionUtils.java</title><link rel="stylesheet" href="../jacoco-resources/prettify.css" type="text/css"/><script type="text/javascript" src="../jacoco-resources/prettify.js"></script></head><body onload="window['PR_TAB_WIDTH']=4;prettyPrint()"><div class="breadcrumb" id="breadcrumb"><span class="info"><a href="../jacoco-sessions.html" class="el_session">Sessions</a></span><a href="../index.html" class="el_report">SteelBlue - JavaFX Bindings</a> > <a href="index.source.html" class="el_package">it.tidalwave.role.ui.javafx.impl.util</a> > <span class="el_source">ReflectionUtils.java</span></div><h1>ReflectionUtils.java</h1><pre class="source lang-java linenums">/*
* *********************************************************************************************************************
*
* SteelBlue: DCI User Interfaces
* http://tidalwave.it/projects/steelblue
*
* Copyright (C) 2015 - 2021 by Tidalwave s.a.s. (http://tidalwave.it)
*
* *********************************************************************************************************************
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* *********************************************************************************************************************
*
* git clone https://bitbucket.org/tidalwave/steelblue-src
* git clone https://github.com/tidalwave-it/steelblue-src
*
* *********************************************************************************************************************
*/
package it.tidalwave.role.ui.javafx.impl.util;
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.inject.Inject;
import static java.util.stream.Collectors.toList;
import static it.tidalwave.role.spi.impl.LogUtil.*;
/***********************************************************************************************************************
*
* Just slightly adapted from http://www.artima.com/weblogs/viewpost.jsp?thread=208860
*
* TODO: Consider incorporating this in TFT.
Consider incorporating this in TFT.
*
* @author Fabrizio Giudici
* @author based on code of Ian Robertson
*
**********************************************************************************************************************/
<span class="nc" id="L60">@Slf4j @UtilityClass</span>
<span class="nc" id="L61">public class ReflectionUtils</span>
{
/*******************************************************************************************************************
*
*
*
******************************************************************************************************************/
public static void injectDependencies (@Nonnull final Object object, @Nonnull final Map<Class<?>, Object> beans)
{
<span class="nc bnc" id="L70" title="All 2 branches missed."> for (final Field field : object.getClass().getDeclaredFields())</span>
{
<span class="nc bnc" id="L72" title="All 2 branches missed."> if (field.getAnnotation(Inject.class) != null)</span>
{
<span class="nc" id="L74"> field.setAccessible(true);</span>
<span class="nc" id="L75"> final Class<?> type = field.getType();</span>
<span class="nc" id="L76"> final Object dependency = beans.get(type);</span>
<span class="nc bnc" id="L78" title="All 2 branches missed."> if (dependency == null)</span>
{
<span class="nc" id="L80"> throw new RuntimeException("Can't inject " + object + "." + field.getName());</span>
}
try
{
<span class="nc" id="L85"> field.set(object, dependency);</span>
}
<span class="nc" id="L87"> catch (IllegalArgumentException | IllegalAccessException e)</span>
{
<span class="nc" id="L89"> throw new RuntimeException(e);</span>
<span class="nc" id="L90"> }</span>
}
}
<span class="nc" id="L93"> }</span>
/*******************************************************************************************************************
*
* Instantiates an object of the given class performing dependency injections through the constructor.
*
* @param <T> the generic type of the object to instantiate
* @param type the dynamic type of the object to instantiate; it is expected to have a single constructor
* @param beans the pool of objects to instantiate
* @return the new instance
* @throws RuntimeException if something fails
*
******************************************************************************************************************/
public static <T> T instantiateWithDependencies (@Nonnull final Class<T> type,
@Nonnull final Map<Class<?>, Object> beans)
{
try
{
<span class="nc" id="L111"> log.debug("instantiateWithDependencies({}, {})", shortName(type), shortIds(beans.values()));</span>
<span class="nc" id="L112"> final Constructor<?>[] constructors = type.getConstructors();</span>
<span class="nc bnc" id="L114" title="All 2 branches missed."> if (constructors.length > 1)</span>
{
<span class="nc" id="L116"> throw new RuntimeException("Multiple constructors in " + type);</span>
}
<span class="nc" id="L119"> final List<Object> parameters =</span>
<span class="nc" id="L120"> Arrays.stream(constructors[0].getParameterTypes()).map(beans::get).collect(toList());</span>
<span class="nc" id="L122"> log.trace(">>>> ctor arguments: {}", shortIds(parameters));</span>
<span class="nc" id="L123"> return type.cast(constructors[0].newInstance(parameters.toArray()));</span>
}
<span class="nc" id="L125"> catch (InstantiationException | IllegalAccessException | InvocationTargetException e)</span>
{
<span class="nc" id="L127"> throw new RuntimeException(e);</span>
}
}
/*******************************************************************************************************************
*
* Get the actual type arguments a child class has used to extend a generic base class.
*
* @param baseClass the base class
* @param childClass the child class
* @return a list of the raw classes for the actual type arguments.
*
******************************************************************************************************************/
public static <T> List<Class<?>> getTypeArguments (@Nonnull final Class<T> baseClass,
@Nonnull final Class<? extends T> childClass)
{
<span class="nc" id="L143"> final Map<Type, Type> resolvedTypes = new HashMap<>();</span>
<span class="nc" id="L144"> Type type = childClass;</span>
// start walking up the inheritance hierarchy until we hit baseClass
<span class="nc bnc" id="L147" title="All 2 branches missed."> while (!getClass(type).equals(baseClass))</span>
{
<span class="nc bnc" id="L149" title="All 2 branches missed."> if (type instanceof Class<?>)</span>
{
// there is no useful information for us in raw types, so just keep going.
<span class="nc" id="L152"> type = ((Class<?>)type).getGenericSuperclass();</span>
}
else
{
<span class="nc" id="L156"> final ParameterizedType parameterizedType = (ParameterizedType) type;</span>
<span class="nc" id="L157"> final Class<?> rawType = (Class) parameterizedType.getRawType();</span>
<span class="nc" id="L158"> final Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();</span>
<span class="nc" id="L159"> final TypeVariable<?>[] typeParameters = rawType.getTypeParameters();</span>
<span class="nc bnc" id="L161" title="All 2 branches missed."> for (int i = 0; i < actualTypeArguments.length; i++)</span>
{
<span class="nc" id="L163"> resolvedTypes.put(typeParameters[i], actualTypeArguments[i]);</span>
}
<span class="nc bnc" id="L166" title="All 2 branches missed."> if (!rawType.equals(baseClass))</span>
{
<span class="nc" id="L168"> type = rawType.getGenericSuperclass();</span>
}
<span class="nc" id="L170"> }</span>
}
// finally, for each actual type argument provided to baseClass, determine (if possible)
// the raw class for that type argument.
final Type[] actualTypeArguments;
<span class="nc bnc" id="L177" title="All 2 branches missed."> if (type instanceof Class)</span>
{
<span class="nc" id="L179"> actualTypeArguments = ((Class)type).getTypeParameters();</span>
}
else
{
<span class="nc" id="L183"> actualTypeArguments = ((ParameterizedType)type).getActualTypeArguments();</span>
}
<span class="nc" id="L186"> final List<Class<?>> typeArgumentsAsClasses = new ArrayList<>();</span>
// resolve types by chasing down type variables.
<span class="nc bnc" id="L188" title="All 2 branches missed."> for (Type baseType : actualTypeArguments)</span>
{
<span class="nc bnc" id="L190" title="All 2 branches missed."> while (resolvedTypes.containsKey(baseType))</span>
{
<span class="nc" id="L192"> baseType = resolvedTypes.get(baseType);</span>
}
<span class="nc" id="L195"> typeArgumentsAsClasses.add(getClass(baseType));</span>
}
<span class="nc" id="L198"> return typeArgumentsAsClasses;</span>
}
/*******************************************************************************************************************
*
*
*
******************************************************************************************************************/
@CheckForNull
public static Class<?> getClass (@Nonnull final Type type)
{
<span class="nc bnc" id="L209" title="All 2 branches missed."> if (type instanceof Class<?>)</span>
{
<span class="nc" id="L211"> return (Class<?>)type;</span>
}
<span class="nc bnc" id="L213" title="All 2 branches missed."> else if (type instanceof ParameterizedType)</span>
{
<span class="nc" id="L215"> return getClass(((ParameterizedType)type).getRawType());</span>
}
<span class="nc bnc" id="L217" title="All 2 branches missed."> else if (type instanceof GenericArrayType)</span>
{
<span class="nc" id="L219"> final Type componentType = ((GenericArrayType)type).getGenericComponentType();</span>
<span class="nc" id="L220"> final Class<?> componentClass = getClass(componentType);</span>
<span class="nc bnc" id="L222" title="All 2 branches missed."> if (componentClass == null)</span>
{
<span class="nc" id="L224"> return null;</span>
}
<span class="nc" id="L227"> return Array.newInstance(componentClass, 0).getClass();</span>
}
else
{
<span class="nc" id="L231"> return null;</span>
}
}
}
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